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Sea&Sea YS-90 TTL Auto Strobes & Flashes 
YS-90 TTL/AUTO Strobe
 Automatically controls the light level. For strobe auto photography using a digital camera, all you need to do is to set the aperture control of the strobe to that of camera.
A high-performance auto strobe YS-90AUTO has been added to Sea & Sea YS-90 series. Designed to fully utilize the advanced features of digital cameras, YS-90AUTO responds to 12 steps of aperture level and offers improved performance. For digital cameras with manual aperture control or program auto function, you simply turn the dial to adjust the aperture level of YS-90AUTO and you're ready for auto strobe lighting. No complicated manual light level controls. Just leave it on the auto sensor and YS-90 supplies appropriate amount of light.
 The strobe has excellent performance including pre-flash mode. Connection with the optional YS-90 optic fiber cable makes the strobe compatible with compact-type digital cameras. Auto strobe lighting is also available with digital SLR housings (DX-30/60, DX-D100) through connection with a strobe sync cord. YS-90AUTO's built-in Duo circuit responds to N-type (used in MMIII) and S-type TTL circuits, both used in Sea & Sea housings.
Additional features:
- Slave function
- Auto lighting function
- Over-pressure relief valve
- Pre-flash mode
Specifications:
| Guide Number: |
22 (land, at full flash) |
| Coverage angle: |
105º x 95º |
| Battery life: |
200 flashes (alkaline battery, at full flash), 120 flashes (Ni-Cd battery, at full flash) |
| Recycle time: |
6.5 seconds (alkaline battery, at full flash), 4 seconds (Ni-Cd battery, at full flash) |
| Aperture level control: |
f22 / f16 / f11 / f8 / f5.6 / f6.7 / f5.6 / f4.7 / f3.4 / f2.8 / f2.4 / f2 (12 steps) |
| Color temperature: |
5400ºK (at full flash), 5100ºK (with light reduction filter)
Compatible with both detachable sync cord and optic fiber cable |
| Battery requirement: |
4x AA Alkaline (6V) or Ni-Cd (4.8V) batteries |
| Depth rating: |
60m/200 feet |
| Dimensions: |
(HxWxD): 115 x 88 x 175mm/4.5 x 3.5 x 6.9 inches |
| Land weight: |
740g/1.6 lbs |
| Underwater weight: |
-80g/-2.8 oz |
Strobe Comparison:
| Strobe |
GN (Land) (m/ft) |
Beam Angle |
Number of Flashes |
Recycle Time |
| YS-350TTL Pro |
32/105 |
105º |
120 |
4 sec. |
| YS-120TTL Duo |
22/72 |
105º x 105º |
A: 280
Ni: 140 |
A: 4 sec.
Ni: 3 sec. |
| YS-90TTL Duo |
22/72 |
105º x 95º |
A: 200
Ni: 120 |
A: 6.5 sec.
Ni: 4 sec. |
| YS-90 DX |
22/72 |
105º x 95º |
A: 200
Ni: 120 |
A: 6.5 sec.
Ni: 4 sec. |
| YS-90 Auto |
22/72 |
105º x 95º |
A: 200
Ni: 120 |
A: 6.5 sec.
Ni: 4 sec. |
| YS-60TTL N/S |
22/72 |
105º x 95º |
A: 200
Ni: 120 |
A: 6.5 sec.
Ni: 4 sec. |
| YS-30TTL Duo |
20/66 |
80º x 55º |
A: 250
Ni: 140 |
A: 5 sec.
Ni: 4 sec. |
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